Hi Stu

> 1. a vc offset is also a dc offset. so that any audio signal that distorts will distort
> assymetrically.

No, usually all audio related modules are ac coupled. The dc offset,
whic you added carefully, will be removed by the first capacitor in the
signal path. Sorry to spoil that game.

> 3. already mentioned: i'd like to have vco's play in thirds. a 138 would do it, but it's
> slightly overkill, oder (dieter, is there a hack to increase the range of the tune knob on
> the standard vco )

Yes. It was described a dozen times here in the forum. Check
http://www.doepfer.de/a110_tec.htm
reduce R5 (e.g. to 470k)

> and there must be a dozen other things that i'm forgetting or that other users need that i
> don't.

I know what you mean, (and I do it often), but I do it simply with a mixer.

> it appears i'm dancing around under the radar here, which implies that silas is quite right
> that there's not enough interest. i'm just puzzled that nobody else sees any sense in it.

No dancing under the radar. Looks like simply everybody carries an
umbrella, but you mismatch umbrellas with radars ;-)

Use a mixer, like every one does.

Florian